Yar i am no expert but i think this Petron 20w50 is no good at all. You can choose between the following at Toyota G.T Motors:
1. 10w30 Mineral Based Oil (Tin Packing, the one i am using right now) 3717 Rs. (4-Litre Pack) Range: 5000Kms
Toyota genuine motor oil is high performance Mineral Base engine oil designed for Toyota vehicle to provide a high level of performance & protection under low temperature conditions. Especially in the Northern areas of Pakistan.
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5w50 Fully Synthetic Oil (It is called "TAGLON", a product of Petron) 3300 Rs. (4-Litre Pack) Range: 5000Kms
Toyota Genuine motor oil is high performance Synthetic engine oil formulated & imported from Japan with good quality base oil which meets the demand of petrol engine especially in lower temperature condition.